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Java Forum / General / March 2008Question on multi-thread execute the same method of same class instance
Hi all Just want to ask when multi-thread execute the exact the same method what happened? each thread create its own space to save method variables....?? Thanks Steven Hi, yes, for what regards variables defined in the method, they are created in a different copy for every executing thread. Of course this doesn't happen to variables defined outside the method, and this is the case where synchronization could be required. So long, Stefano > Hi all > [quoted text clipped - 5 lines] > > Steven > Hi, > > yes, for what regards variables defined in the method, they are > created in a different copy for every executing thread. Of course this > doesn't happen to variables defined outside the method, and this is > the case where synchronization could be required. This is true and in addition there is a separate copy of local variables each time the method is activated, including multiple instances within the same thread. Matthew Humphrey http://www.iviz.com/ > > Hi, > [quoted text clipped - 8 lines] > > Matthew Humphreyhttp://www.iviz.com/ Thank you very much for that. On Mar 28, 10:06 pm, Stefano Brocchi <stefano.broc...@researchandtechnology.net> wrote: > Hi, > [quoted text clipped - 15 lines] > > > Steven Thank you very much. > Thank you very much. You actually don't need to permanently fill the newsgroup archives with numerous redundant and superfluous unnecessary repetitive frequent but polite "thank you" posts. Just let the information stand on its merit for all to see.  SignatureLew >Just want to ask when multi-thread execute the exact the same method >what happened? > >each thread create its own space to save method variables....?? >Thanks Local variables live on a stack. Each thread gets its own stack. So each thread has its own copy of any local variables. However they share the instance and static variables. You have to use locking, volatile and other tricks to make sure the threads don't interfere with each other. See http://mindprod.com/jgloss/thread.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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